Motor-controller.



M. M. GOLDENSTEIN.

MOTOR CONTROLLER.

APPLICATION FILED OCT- lo. 1913.

THE cuLUMBM PLANOGRAPH co, WASIHNGTDN. n. c.

UNITED STATES PATENT ()FFIQE.

MAURICE M. GOLDENSTEIN, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE CUTLER- HAMMER MFG. GO., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

MOTOR-CONTROLLER.

Application filed October 10, 1913.

To all whom it may concern:

Be it known that I, MAURICE M. GOLDEN- STEIN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of WVisconsin, have invented new and useful Improvements in Motor- Controllers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention relates to improvements in controllers for electric motors.

It has among its objects to provide a controller for automatically slowing down a motor for a temporary period and then automatically reaccelerating the same.

Various other objects and advantages of my invention will hereinafter appear.

My invention may be advantageously employed for various classes of motor-driven machinery and especially motor-driven printing presses, where it is desired to periodically slow down the press for tympan changing and then restore the press to running speed.

In practice my invention may be applied to various forms of controllers but is particularly applicable to controllers such as that disclosed in my co-pending application, Serial No. 794,415 filed Oct. 10, 1913, and in the accompanying drawing-it has been so applied. V

The drawing shows diagrammatically a shunt motor having an armature A and a field winding F and controlled, as in my copending application, by an electro-responsive main switch 1, and electromagnetic speed regulator 2 and a push-button control station 3. In this instance, however, the controller embodies additional features, which will be hereinafter specifically set forth. The main line switch 1 is responsive to complete the motor circuit, and is adapted when deenergized to control the rheostat 2 through auxiliary contacts 4 and 5.

The rheostat 2 comprises a contact-carrying cross-head 6 disposedbetween and mov able over two series of contacts 7 and 8 to control resistances R and R in series with the motor armature. The cross-head 6 normally stands in the position illustrated and is adapted to be elevated to such position by a solenoid 9. The cross-head descends by gravity to exclude the resistances R and R from the motor circuit, and its descent is Specification of Letters Patent.

Patented Mar. 14, 1916.

Serial No. 794,414.

controlled by a pawl 10 cooperating with a ratchet extension 11 of the plunger of solenoid 9. The pawl 10 normally engages the teeth of said ratchet extension and is adapted to be withdrawn therefrom by an electromagnet 12. The magnetically controlled pawl 10 thus affords means for releasing the cross-head and checking the same in any one of a plurality of differentoperative positions to regulate the speed of the motor according to its position. The cross-head 6 also carries an insulated contact 13 adapted to move over a contact strip 14 and a series of contact buttons 15, the latter corresponding in number to the different operative positions of the cross-head. These contacts, as will hereinafter appear, control the pawl releasing magnet 12.

The control station 3 comprises normally open push-button switches 16 and 17, a switch 18, preferably a snap switch, and a switch 19.

Briefly set forth the control switches function as follows: The switch 18 controls main switch 1 to start and stop the motor. The switch 16, when closed, energizes the magnet 12 to effect the release of the crosshead to accelerate the motor. The switch 17, when closed, energizes solenoid 9 to raise the cross-head and thus slow down the motor. Switch 19 is associated with contacts 13, 14 and 15. Again referring to contacts 13, 14 and 15, the same serve to establish a shunt around the push-button switch 16. As above stated, switch 16 when closed energizes release magnet 12, but being biased to open position it tends to deenergize said magnet immediately upon its release. The shunt, however, establishes a maintaining circuit for the magnet 12 which renders the release of switch 16 ineffective to deenergize said magnet. Thus magnet 12 is, upon depression of switch 16, maintained energized until the shunt is interrupted and the connections of the contacts 15 may, as will hereinafter appear, be varied to maintain said shunt throughout any predetermined range of movement of the cross-head. In practice, the contacts are preferably so connected as to establish tie shunt upon initial descent of the cross-head and to maintain said shunt until the cross-head descends to normal running position. With this arrangement, after the motor is started it may be automatically brought up to normal running speed by momentary depression of the push-button switch 16. The switch 19 is provided to open said shunt circuit at will to check the descent of the crosshead before it reaches running. position where a slower speed of the motor is desired.

Referring now to the additional elements of the present controller, thesaure include an automatic contact making and breaking device 20 and second series of contactsfll associated with the cross-head to be engaged by the contact 13. These parts, as will be hereinafter more fully set forth, control the lifting solenoid 9 to effect automatic slow down. The former governs the frequency and duration of the slowdown periods and the latter the degree offslo'w down.

The device 20 may, in'practice," assume various different forms and may be operated in any preferred way. As shown, the same comprises a revoluble" contact 22 adapted to make and break circuit between cooperating contacts 23 and 24. The contact'22 may be assumed to be operated by the motor and at such a relative speed as to bridge contacts 23 and at intervals suitable for tympan changing.

The circuit connections illustrated are as follows: Main line switch 1 when closed completes circuit from line L, by conductor 25 through the resistance R, cross-head 6, resistance R, by conductor 26 through the motor armature, by conductor 27 through said switch 1, .by conductor 28 to line L. The field circuit of the motor extends from line L by condu'ctor29 through field winding F,'by conductor'30 to line L. The circuit'of the operating winding of switch 1 extends from line L by conductor '31 through switch 18', by conductor 32 through said winding, by conductors 33 and 28"to line L. The circuit of the release magnet 12 extends from line L by conductor 31 through switch 18, by conductors'34 and 35, through switch 16, by conductor 36 through said winding,l2, by conductors 39 and 40 to line L. The shunt around the push-button switch 16 extends from conductor 34 through switch 19 by conductor 41 to contact strip 14- across contact 13 to contact buttons 15, by conductor 42 to'conductor 36. The circuit of lifting solenoid 9 extends from line L by conductors 31 and 43 through switch 17, by conductor 44 through auxiliary switch45 operated-by the solenoid 9, thence through said solenoid by conductors 46 and 40 to "line L. The circuit of the solenoid 9, which is closed by main line switchl, when deenergizedyextends from conductor'43 by conductor 47 through auxiliary contacts 4 and 5 of said switch, by conductor 48 to conductor '44. The circuit of solenoid '9, established by i the contacts 15, with the exception of the lower ones, are interconnected. Accordingly'the shunt controlled by the contacts 13 and 14 is established upon initial descent of the cross head and is maintained until the crosshe'ad descends to the point marked X, which, it may be assumed, is normal running position of the controller. The contacts 21, on the other hand, are interconnected in the reverse manner, or in other words, they are all connected with the exception of the two at the top. Accordingly they connect contact 23 of the device 20 to the supply line in all but the two upper positions ofthe cross-head'ti. Thus the device 20 is adapted to energize the solenoid 9 in all positions of the cross-head except those just mentioned, and upon energizing the same, affects elevation of the cross-head to the point marked X. VVhen the crosshead passes this point it disconnects the device 20 from the supply circuit and accordingly the point X constitutes the limit of deceleration. Hence with the connections illustrated the make and break of the device -20 automatically affects decelerationto a speed corresponding to position X of the cross-head speed corresponding with position X of the cross-head.

Aswill now be apparent, the degree of slow down may be readily regulated by adjustment of the connections of contacts '21, for example by connecting in circuit the next above contactas shown in dotted lines while the duration of the slow speed period may be regulated as desired by varying the duration of engagement between the contacts of device 20.

What I claim as new and desire to secure by Letters Patent is:

1. In a motor controller, in combination means for starting and accelerating the moand i then reacceleration to a the same operates continuously in one direction and after a temporary period again accelerate the same automatically.

3. In a motor controller, in combination, means for starting and accelerating the motor, and means controlling said former means to effect periodic slow down of the motor to any one of a number of predetermined speeds.

4. In a motor controller, in combination, means for starting and accelerating the motor, and means controlling said former means to slow down the motor to any one of a number of predetermined speeds and after the lapse of a temporary period effect reacceleration of the motor.

5. In a motor controller, in combination, an electro-magnetically controlled rheostat, and means associated therewith to efiect automatic operation thereof in opposite directions between certain limits, said means being adjustable to vary said limits.

6. In a motor controller, in combination, a rheostat for controlling the speed of the motor, means controlling said rheostat to slow down the motor and after a temporary period reaccelerate the same including adjustable means for limiting the slow down movement of said rheostat.

7. In a motor controller, in combination, a speed controlling rheostat tending when in any one of a plurality of positions to move automatically to a different predetermined position, and means for effecting movement of said rheostat to one of said first-mentioned positions to effect a temporary slow down and subsequent automatic acceleration.

8. In a motor controller, in combination, a speed-controlling rheostat, and means for effecting movement of said rheostat toward initial position and automatically arresting the same in any one of a number of intermediate positions, and means tending to effect subsequent operation of said rheostat to a predetermined increased speed position.

9. In a motor controller, in combination, starting and accelerating means including a speed controlling rheostat, and means for effecting operation of said rheostat from any one of a number of operative positions to different predetermined positions to slow down the motor for a temporary period, and means for effecting return of said rheostat to its former position automatically upon the expiration of said temporary period.

10. In a motor controller, in combination, a speed controlling rheostat having electromagnetic means controlling its operation in opposite directions, and means control ling said electromagnetic means to effect slow down of the motor and after a temporary period automatically effect re-acceleration of the motor.

11. In a motor controller, in combination, a speed controlling rheostat having electromagnetic means controlling its operation in opposite directions, and means controlling said electromagnetic means to effect slow down of the motor and after a temporary period automatically eflect re-acceleration of the motor, said last-mentioned means being adjustable to vary the limit of the slow down movement of said rheostat.

12. In a motor controller, in combination, a speed controlling rheostat, electromagnetic means for controlling the operation of said rheostat in opposite directions, and means controlling said electromagnetic means to effect sloW down movement of said rheostat to any one of a number of predetermined positions and thereupon arrest such movement, and other means controlling said electromagnetic means to affect automatic return of said rheostat to its former position.

13. In a motor controller, in combination, electromagnetically controlled means for regulating the speed of the motor, automatic means controlling said former means to slow down the motor for temporary periods, and means for limiting the slow down operation of said electromagnetically controlled means to any one of a number of predetermined positions.

In Witness whereof, I have hereunto subscribed my name in the presence of two Witnesses.

MAURICE H. GOLDENSTEIN.

Witnesses:

L. P. Com/ran, H. P. REED.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

